JPH0347959B2 - - Google Patents
Info
- Publication number
- JPH0347959B2 JPH0347959B2 JP60210765A JP21076585A JPH0347959B2 JP H0347959 B2 JPH0347959 B2 JP H0347959B2 JP 60210765 A JP60210765 A JP 60210765A JP 21076585 A JP21076585 A JP 21076585A JP H0347959 B2 JPH0347959 B2 JP H0347959B2
- Authority
- JP
- Japan
- Prior art keywords
- bottom member
- slag
- pot
- inner diameter
- slag pot
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000002893 slag Substances 0.000 claims description 39
- 238000005520 cutting process Methods 0.000 claims description 22
- 230000008439 repair process Effects 0.000 claims description 21
- 238000003466 welding Methods 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 12
- 230000003628 erosive effect Effects 0.000 claims description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 10
- 239000002184 metal Substances 0.000 description 9
- 229910052751 metal Inorganic materials 0.000 description 9
- 229910000831 Steel Inorganic materials 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- 230000006866 deterioration Effects 0.000 description 5
- 229910052742 iron Inorganic materials 0.000 description 5
- 238000002844 melting Methods 0.000 description 4
- 230000008018 melting Effects 0.000 description 4
- 229910001208 Crucible steel Inorganic materials 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000035882 stress Effects 0.000 description 2
- 241000270708 Testudinidae Species 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 238000004021 metal welding Methods 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
Landscapes
- Butt Welding And Welding Of Specific Article (AREA)
- Manufacture Of Iron (AREA)
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明はスラグポツト補修方法に関し、さらに
詳しくは、溶銑または溶鋼予備処理、造塊、連続
鋳造等で発生または残留した溶融スラグを受滓
し、のろ処理場に搬送するスラグポツトの補修方
法に関するものである。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a slag pot repair method, and more specifically, the present invention relates to a slag pot repair method, and more specifically, a method for collecting molten slag generated or remaining in hot metal or molten steel pretreatment, ingot making, continuous casting, etc. This relates to a method for repairing slag pots that are transported to slow treatment plants.
［従来技術］
従来において、スラグポツトに亀裂が発生した
り、比較的軽度の溶損や変形劣化が生じた場合に
は、その部分をガウジング手入れを行なつた後肉
盛溶接により補修をしていたが、突発溶損事故等
で大きな孔があいたり、大きな変形や局部的な著
しい材質劣化が生じた場合には修理が不可能であ
つた。従つて、スラグポツトは３〜４年程度の使
用で廃棄処分にして新しいスラグポツトを使用し
ていた。[Prior art] In the past, when cracks occurred in a slag pot, or relatively minor erosion or deformation occurred, the affected area was repaired by gouging and then repaired by overlay welding. However, if large holes were created due to sudden meltdown accidents, large deformations, or significant local material deterioration occurred, repair was impossible. Therefore, slag pots are disposed of after being used for about 3 to 4 years, and new slag pots are used.
その他、内容積が９m3級のスラグポツトの使用
において、地金といわれる溶融金属がスラグに混
じつて３屯近くもスラグポツトに注入されること
が屡々見られ、そのために、１年程度で使用不能
となり、修理も極めて困難となつて屋外に放置さ
れることもある。 In addition, when using a slag pot with an internal volume of 9 m3 , it is often seen that nearly 3 tons of molten metal, called bullion, is mixed with the slag and poured into the slag pot, which makes it unusable after about a year. In some cases, it becomes extremely difficult to repair and is left outdoors.
［発明が解決しようとする問題点］
本発明は上記に説明したようなスラグポツトの
補修における問題点を解消したものであつて、本
発明者が研究した結果、修理不可能とされていた
極めて大きな亀裂、溶損、変形、地金溶着または
孔あき等により使用できないようなスラグポツト
を、その修理不可能な部分を切断除去して、切断
除去したところに新しい部材を溶接することによ
つて、補修すことができるスラグポツト補修方法
を開発したのである。[Problems to be Solved by the Invention] The present invention solves the problems in repairing slag pots as explained above. Repairing slag pots that are unusable due to cracks, erosion, deformation, metal welding, or holes by cutting and removing the unrepairable parts and welding new parts in the cut and removed parts. We have developed a method for repairing slag pots.
［問題点を解決するための手段］
本発明に係るスラグポツト補修方法の特徴とす
るところは、亀裂、溶損、変形劣化等により使用
不可能になつたスラグポツトの補修に際し、スラ
グポツト底部より高さ700〜1400mmの位置で切断
して上部流用側本体より底部材を除去し、次い
で、上部流用側本体の切断線における内径より10
〜100mm大きい内径の底部材を、上部流用側本体
の切断部と溶接することにある。[Means for Solving the Problems] A feature of the slag pot repair method according to the present invention is that when repairing a slag pot that has become unusable due to cracks, melting damage, deformation, etc. Cut at a position of ~1400 mm to remove the bottom member from the upper flow side body, then cut 10 mm from the inner diameter of the upper flow side body at the cutting line.
The bottom member with an inner diameter larger by ~100 mm is welded to the cut part of the upper flow side body.
本発明に係るスラグポツト補修方法について以
下詳細に説明する。 The slag pot repair method according to the present invention will be explained in detail below.
この種スラグポツトは、溶融金属が少量混入す
る高温の溶融スラグを注入して冷却して搬送する
鋳鋼製の容器であるから、急熱急冷の過酷な熱応
力を受け、鉄皮自身がスラグの熱を吸収して冷却
凝固させるための充分な熱容量を保有し、さら
に、熱膨張や収縮変形に対して良好な順応形を有
するものであることが必要であり、かつ、亀裂や
変形劣化、損傷のできるだけ生じ難いものであつ
て、安全で破損しないという要求がある。 This type of slag pot is a cast steel container in which high-temperature molten slag with a small amount of molten metal mixed in is injected, cooled, and transported, so it is subjected to severe thermal stress due to rapid heating and cooling, and the steel shell itself is exposed to the heat of the slag. It must have sufficient heat capacity to absorb and cool and solidify the material, and also have good adaptability to thermal expansion and contraction deformation, and must be resistant to cracks, deformation deterioration, and damage. There is a demand for something that is as hard to occur as possible, safe and undamageable.
しかして、スラグポツトは長期間の使用により
上記した要求にも拘らず、必然的に亀裂が入つた
り、溶損したり、金属疲労による劣化等は避ける
ことができず、スラグポツトの特に内側底部にこ
れらが集中することから、スラグポツト底部から
700〜1400mmの高さのスラグポツト板厚の６〜10
倍のところで、スラグポツトの上部流用側本体か
ら底部材を切断して除去するのであるが、この範
囲において充分な伸び変形が維持されるように配
慮し、かつ、形状、構造の複雑な最下部を避けて
応力集中を緩和するための普行部位で切断するこ
とにより作業を容易とするのである。 However, despite the above-mentioned requirements, slag pots inevitably develop cracks, melt damage, and deterioration due to metal fatigue due to long-term use. from the bottom of the slag pot.
6-10 of slag pot plate thickness with height of 700-1400mm
At the double point, the bottom member is cut and removed from the upper body of the slug pot, but care must be taken to maintain sufficient elongation deformation in this range, and to remove the bottom part, which has a complex shape and structure. The work is made easier by cutting at the usual places to avoid stress concentration.
この切断の高さが700mm未満では切断や溶接が
欠陥なしには行なうことができないため、急熱急
冷を受けるスラグポツトにおいては補修すること
によつても安全は確保できず、また、この高さ
1400mmを越すと上部流用側本体の複雑な部分に近
くなるので作業性が悪く、補修した後の品質も劣
化するようになる。従つて、切断する高さをスラ
グポツト底部から1400mm以下にしないと、切断後
に新しい底部材との溶接時に溶接部周辺の拘束度
が大きくなるため、割れが発生したり、補修後の
スラグポツトは残留応力が過大であるので長期間
の使用に耐えず、極めて短かい期間の使用しかで
きず、安全確保ができないので実用には適さな
い。よつて、切断位置はスラグポツト底部から
700〜1400mmとする。 If the cutting height is less than 700 mm, cutting or welding cannot be performed without defects, so in slag pots that undergo rapid heating and cooling, safety cannot be ensured even by repair.
If the length exceeds 1400 mm, the workability will be poor as it will be close to the complicated part of the upper diverted body, and the quality after repair will also deteriorate. Therefore, if the cutting height is not 1400 mm or less from the bottom of the slag pot, the degree of restraint around the weld will increase when welding with a new bottom member after cutting, resulting in cracks or residual stress in the slag pot after repair. Since it is too large, it cannot withstand long-term use, and can only be used for a very short period of time, and safety cannot be ensured, so it is not suitable for practical use. Therefore, the cutting position is from the bottom of the slag pot.
It should be 700-1400mm.
また、上記説明したように、亀裂、溶損、変形
劣化、損傷等のある底部材を切断して除去した後
で、上部流用側本体の切断線における内径より10
〜100mm大きい内径の底部材を製作しておくので
あるが、これは、亀裂、溶損、変形劣化、損傷等
の顕著である底部材を切断除去した後、新しく製
作した底部材を溶接により接合させるので、上部
流用側本体の切断線近傍は径が小さくなつている
ものであるから、新しい底部材の径は10mm以上大
きくしなければ使用上支障があり、この径差を小
さくすればする程修理時における溶接は容易であ
るが、修理完了時の仕上りが不良となるので、切
断した上部流用側本体の切断線内径より底部材の
内径を10mm以上としなければならず、また、底部
材の径を100mmを越えて大きくすると補修後のス
ラグポツトの地金詰りが多発するようになるとい
う問題が生じる。従つて、上部流用側本体の切断
線における内径より10〜100mm大きい内径の底部
材とするのである。 In addition, as explained above, after cutting and removing the bottom member with cracks, melting loss, deformation deterioration, damage, etc.,
A bottom member with an inner diameter ~100 mm larger is manufactured in advance, and after cutting and removing the bottom member that has noticeable cracks, melting, deformation, and damage, the newly manufactured bottom member is joined by welding. Therefore, the diameter of the upper flow-side main body is smaller near the cutting line, so the diameter of the new bottom member must be increased by at least 10 mm or it will be difficult to use, so the smaller this diameter difference, the more Welding during repair is easy, but the finish will be poor when the repair is completed, so the inner diameter of the bottom member must be 10 mm or more than the inner diameter of the cut line of the upper diverted body. If the diameter is increased beyond 100 mm, a problem arises in that the slag pot becomes frequently clogged with metal after repair. Therefore, the bottom member has an inner diameter that is 10 to 100 mm larger than the inner diameter at the cutting line of the upper flow-side main body.
さらに、上部流用側本体の切断線における内径
より10〜100mm大きい内径の底部材を使用するこ
とについて説明する。 Furthermore, the use of a bottom member having an inner diameter 10 to 100 mm larger than the inner diameter at the cutting line of the upper flow-side main body will be explained.
即ち、劣化した上部流用側本体の鉄皮内側表面
は、無数の亀甲状の熱による亀裂が多数発生して
おり、この亀裂の深さは浅いもので鉄皮板厚の約
５％、例えば、３〜４mmである。 That is, on the inner surface of the iron skin of the deteriorated upper diversion side main body, numerous tortoise shell-shaped cracks due to heat have occurred, and the depth of these cracks is shallow and is about 5% of the steel skin thickness, for example. It is 3 to 4 mm.
しかし、亀裂の先端は一直線ではなく、多少の
凹凸があるから、実際には鉄皮板厚の約７％、倒
えば、５mm前後は補修時に鉄皮内側表面を溶削し
ておくのが、品質上重要なことである。 However, since the tip of the crack is not a straight line and has some unevenness, it is actually best to melt the inner surface of the steel skin by about 7% of the thickness of the steel skin, or about 5mm if it falls, during repair. This is important in terms of quality.
従つて、新しい底部材の内径を上記した溶削分
だけ最小限大きくすることが必要であり、新しい
底部材の内径の下限は10mmと規定するのである。 Therefore, it is necessary to minimize the inner diameter of the new bottom member by the amount of the above-described cutting, and the lower limit of the inner diameter of the new bottom member is defined as 10 mm.
また、劣化した上部流用側本体の切断線近傍
は、変形が最も大きく、径収縮の他に長径と短径
との差が約30mmあるが、新しい底部材と上部流用
側本体を軸芯を同一にして重ね合わせて接合し
て、据え付ける際に、最低約５mm以上の重なり部
分、即ち、支持部が必要であり、この支持部がな
いと極めて不安定となり、多少の誤差もあるので
仮付け溶接を行うことができない。 In addition, near the cutting line of the deteriorated upper diverted body, the deformation is the greatest, and in addition to the diameter shrinkage, there is a difference of about 30 mm between the major axis and the minor axis, but the axis of the new bottom member and the upper diverted body are the same. When overlapping and joining and installing, an overlapping part of at least 5 mm or more, that is, a support part, is required. Without this support part, it will be extremely unstable and there will be some errors, so tack welding is necessary. can't do it.
従つて、上部流用側本体の変形が完全な円形で
あれば、５mmの重ね代を見込んだ場合、上部流用
側本体の鉄皮の厚さを70mmと下時には、
（70−５）×２＝130mm
の大きさがあればよいが、長短径差30mm（実施
例参照）が存在するので、
｛70−（15＋５）｝×２＝100mm
となり、新しい底部材の内径の上限は100mmと
するのである。 Therefore, if the deformation of the upper diverted body is completely circular, and if an overlap of 5 mm is allowed, then if the thickness of the iron skin of the upper diverted body is 70 mm, then (70-5) x 2 = A size of 130 mm is sufficient, but since there is a difference of 30 mm between major and minor axes (see example), {70 - (15 + 5)} x 2 = 100 mm, and the upper limit of the inner diameter of the new bottom member is 100 mm. .
本発明に係るスラグポツトの補修方法について
第１図により説明する。 The slag pot repair method according to the present invention will be explained with reference to FIG.
第１図において、スラグポツトＳの上面を基準
として、スラグポツトＳ底部から高さH4の700〜
1400mmのところの鉄皮内面２にケガキ線を入れ
て、切断３して亀裂、溶損、変形劣化の著しい底
部材（図示せず。）を除去し、新しく製作した底
部材５と替えるのである。 In Figure 1, the height H4 from the bottom of the slag pot S is 700~
A marking line is placed on the inner surface of the steel skin 2 at a position of 1400 mm, and the bottom member (not shown) that is severely cracked, eroded, and deformed is removed by cutting 3 and replaced with a newly manufactured bottom member 5. .
この場合、上部流用側本体１の切断線における
内径D16より、10〜100mm大きい内径D27の新しい
底部材５上端部と上部流用側本体１の切断部とを
溶接した後、上部流用側本体１の内面局部８を溶
削したり、底部材５の外面局部９に肉盛溶接した
りして仕上げるのである。 In this case, after welding the upper end of the new bottom member 5, which has an inner diameter D27 that is 10 to 100 mm larger than the inner diameter D16 at the cutting line of the upper diverted body 1, to the cut part of the upper diverted body 1, The inner surface local part 8 of the side body 1 is finished by melt cutting, or the outer surface local part 9 of the bottom member 5 is overlaid by welding.
［実施例］
次に、本発明係るスラグポツト補修方法の実施
例を説明する。[Example] Next, an example of the slag pot repair method according to the present invention will be described.
実施例 １
変形劣化の著しいスラグポツトを、スラグポツ
ト底部より800mmの位置で切断し、同じ高さの直
径2230.8mm重量、約5.5屯、側面鉄皮厚さ70mm、
底部鉄皮厚さ120mmのSC−46鋳鋼製の底部材を、
上部流用側本体切断部における直径2210mmと突合
せ溶接したところ、約10mmの肌違いが生じて底部
材が大きかつた。そのため、溶接終了後、上部流
用側本体内面の接合部近傍を約10mm、高さ方向に
約40mmの溶削を行なつた後グラインダーがけし、
また、上部流用側本体外表面の接合部近傍を約10
mm、高さ方向約30mmの肉盛溶接を行なつて仕上げ
た。Example 1 A slag pot with significant deformation and deterioration was cut at a position 800 mm from the bottom of the slag pot, and the diameter at the same height was 2230.8 mm, the weight was approximately 5.5 tons, the thickness of the side iron skin was 70 mm,
The bottom part is made of SC-46 cast steel with a thickness of 120 mm.
When we butt-welded the diameter of the cut part of the main body on the upper diverted side to 2210 mm, there was a difference of about 10 mm, making the bottom member larger. Therefore, after welding was completed, the inner surface of the main body on the upper flow side was machined by about 10 mm near the joint and about 40 mm in the height direction, and then ground with a grinder.
In addition, approximately 10
mm, and was completed by overlay welding of approximately 30 mm in the height direction.
結果は非常に良好であり、新品同様の外観形状
に復元でき、かつ、使用開始後８ケ月経過して検
査を行なつたが、亀裂、溶損、変形および地金付
着がなかつた。 The results were very good, and the product was able to be restored to a new appearance, and when it was inspected 8 months after it started being used, there were no cracks, no melting damage, no deformation, and no metal adhesion.
実施例 ２
亀裂と底部孔あきが発生したスラグポツトを、
スラグポツト底部から1300mmの大きな高さのとこ
ろで切断し、予め製作した高さ1300mmの内径
2743.2mm、側面鉄皮厚さ70mm、底板厚さ120mm、
重量８屯のSC−46鋳鋼製底部材を、切線部内径
2840mmの上部流用側本体と溶接したところ、約50
mmの肌違いが生じた。Example 2 A slag pot with cracks and bottom holes was
Cut at a large height of 1300mm from the bottom of the slug pot, and pre-fabricated an inner diameter of 1300mm high.
2743.2mm, side iron skin thickness 70mm, bottom plate thickness 120mm,
The SC-46 cast steel bottom member weighs 8 tons, and the inner diameter of the cutting line is
When welded with the 2840mm upper diverted side body, it was about 50mm.
A skin difference of mm occurred.
これは、上部流用側本体内面の接合部近傍を
CO2半自動肉盛溶接および底部材外側をガス切断
により夫々肌合せを行なつて補修をした。 This is done near the joint on the inner surface of the main body on the upper flow side.
Repairs were made by performing CO 2 semi-automatic overlay welding and gas cutting on the outside of the bottom member.
その結果、スラグポツト底部より1300mmの溶接
線のところでやや折れ曲つたような外観となつた
が、新品同様に補修することができ、さらに、３
ケ月連続して使用したが、地金付着や地金詰り等
の問題は全く認められなかつた。 As a result, the welding line 1300mm from the bottom of the slag pot appeared to be slightly bent, but it could be repaired to make it look like new.
Although I used it continuously for several months, I did not notice any problems such as metal adhesion or metal clogging.
因に、補修工期は新品製作の工期の約1/10であ
り、また、補修費は新品製作費の1/3程度である。 Incidentally, the repair time is approximately 1/10 of the time required to manufacture a new product, and the repair cost is approximately 1/3 of the cost of manufacturing a new product.
［発明の効果］
以上説明したように、本発明に係るスラグポツ
ト補修方法は上記の構成であるから、上部流用側
本体と新しい底部材との接合部は底部材が大きい
状態で補修されるので使用時における熱膨張が可
成り抑制され、また、底部材を計画的に数個余分
に製作しておいて地金付着、孔あき、大亀裂等に
よりスラグポツトが使用できなくなつた時に工期
７〜10日間という比較的早急に底部材を交換する
ことができ、さらに、底部材はスラグポツト全重
量の約1/3程度の軽量であつて、比較的簡単に製
作することができる等の産業上優れた効果を有す
るものである。[Effects of the Invention] As explained above, since the slag pot repair method according to the present invention has the above configuration, the joint between the upper diversion side main body and the new bottom member is repaired while the bottom member is large, so it is not used. Thermal expansion at the time of construction is considerably suppressed, and several extra bottom members are manufactured in a planned manner so that when the slag pot becomes unusable due to metal adhesion, holes, large cracks, etc., the construction period is 7 to 10 minutes. The bottom member can be replaced relatively quickly, within a few days, and the bottom member is lightweight, about 1/3 of the total weight of the slug pot, making it relatively easy to manufacture. It is effective.
第１図は本発明に係るスラグポツト補修方法の
説明図である。
Ｓ……スラグポツト、１……上部流用側本体、
２……鉄皮、３……切断線、４……高さ、５……
底部材、６……上部流用側本体内径（D1）、７…
…底部材内径（D2）、８……内面局部、９……外
面局部。
FIG. 1 is an explanatory diagram of a slag pot repair method according to the present invention. S...Slug pot, 1...Upper diverted side main body,
2... Iron skin, 3... Cutting line, 4... Height, 5...
Bottom member, 6... Upper flow side main body inner diameter (D 1 ), 7...
...Bottom member inner diameter (D 2 ), 8...Inner surface local area, 9...Outer surface local area.
Claims (1)
なつたスラグポツトの補修に際し、スラグポツト
底部より高さ700〜1400mmの位置で切断して上部
流用側本体より底部材を除去し、次いで、上部流
用側本体の切断線における内径より10〜100mm大
きい内径の底部材を、上部流用側本体切断部と溶
接することを特徴とするスラグポツト補修方法。1. When repairing a slag pot that has become unusable due to cracks, erosion, deformation, etc., cut the pot at a height of 700 to 1,400 mm from the bottom of the pot, remove the bottom member from the main body on the upper side, and then remove the bottom member from the main body on the upper side. A slag pot repair method characterized by welding a bottom member having an inner diameter 10 to 100 mm larger than the inner diameter at the cutting line of the side body to the cut portion of the upper diverted side body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21076585A JPS6284891A (en) | 1985-09-24 | 1985-09-24 | Repairing method for slag pot |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21076585A JPS6284891A (en) | 1985-09-24 | 1985-09-24 | Repairing method for slag pot |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6284891A JPS6284891A (en) | 1987-04-18 |
| JPH0347959B2 true JPH0347959B2 (en) | 1991-07-22 |
Family
ID=16594759
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21076585A Granted JPS6284891A (en) | 1985-09-24 | 1985-09-24 | Repairing method for slag pot |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6284891A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104293991A (en) * | 2013-07-17 | 2015-01-21 | 五冶集团上海有限公司 | A cold steel separation device for a slag pot and manufacture method thereof |
| CN105112581B (en) * | 2015-09-02 | 2017-06-06 | 中冶宝钢技术服务有限公司 | One species elliptical deformation section welding slag ladle and preparation method thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5335012A (en) * | 1976-09-07 | 1978-04-01 | Du Pont | Spinnerets and thier manufacture |
-
1985
- 1985-09-24 JP JP21076585A patent/JPS6284891A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5335012A (en) * | 1976-09-07 | 1978-04-01 | Du Pont | Spinnerets and thier manufacture |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6284891A (en) | 1987-04-18 |
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